Paraffin scraper



Feb. 7, 1939. L R UNDERWOQD 2,146,363

PARAFFIN SCRAPER Filed April 50, 1938 In venior ,ZZZZ. girder-W006? A iiorneys v Patented Feb. 7, 1939 g PATENT OFFICE mam soaaraa Leeman Roy Underwood, Ada, 0kla., assignor of one-half to George L. Thompson and Claude V. Thompson, Ada, Okla.

Application April so; 1938, Serial' No. 205334 2 Claims. '(Cl. 16618) This invention appertains to new and. useful improvements in implements whereby theiparaflin in wells can beremoved in a practical and eflicient manner. i

The principal object of the present invention is to provide a tool of the rotary scraper type1 which will be operated to scrape parafiin from a well tubing by the fiow of oil through the tubing.

Still another object of the invention is to provide a scraper which will be positive acting and not susceptible to the ready development of defects.

These and other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawing:- s

Figure 1 represents a side elevational view.

Figure 2 is an enlarged detailed sectional view taken substantially on the line 22 of Figure 1.

Figure 3 is a fragmentary detailed sectional view taken substantially on the line 3-3 of a Figure 1.

- Figure 4 is a side elevational view of a modifled form of scraper. r

Referring to the drawing wherein like numerals designate like parts, it can be seen that numeral 5 represents a connector unit having the .reduced threaded end 'B'and the internally threaded bore 1 at its opposite end for receiving the so threaded end portion 8 of the shaft 9. A jam nut III is provided on the threaded portion 8 for engagement with the body 5 and a cross pin ll prevents self turning of the shaft 5 independently of the body 6.

A still line of small diameter is preferably used and, connectedwith the body 5 'for suspending the tool in a well. h

Numeral I 2 represents an elongated sleeve provided with a spirally disposed flange H at its outer side extending longitudinally thereof. The upper end of this sleeve is internally threaded to receive the knurled plug i4 through which the shaft 9 extends, the sleeve l2 being counterbored l as at IE to form a shoulder against which the 5 bearing ring Hi can bear and between this bearlug ring I6 and the plug I4 is interposed the packing H.

The lower end of the sleeve 12 is internally threaded to receive the reduced and threaded end portion l8 forming the shank of 'the splrally formed scraper blade IS. The lower portion of the sleeve i2 is counterbored to form the shoulder 20 against which the bearing 2| bears and is interposed between this bearing 2| and the head 5 portion 22 at the lower end of the shaft 9 is interposed the ball bearing 23 and additional ball bearings 24 are interposed between the bottom of the head 22 and the upper end of the shank l8.

A slightly modified form of scraper is shown in 10 Figure 4 generally referred to by numeral 255. This scraper consists of an elongated tapering blade structure having the threaded shank and the rectangular-shaped cut out 26 along both longitudinal edge portions, defining serrated 15 edges which will olfer less resistance in cutting through the paraffin. It can be seen, that as the well flows upwardly through the well its eflect on the spiral flange l3 will be to rotate the sleeve l2 independently of the shaft 9, but carry with go it theblade l9 which blade will scrape the paras new is:-.-

1. A paraflin scraper comprising a suspended shaft, a sleeve rotatably mounted on the shaft r and having a spiral flange extending longitudinally thereon; and a blade at the lower end of the 35 sleeve, and bearing means between the upper and lower ends of the sleeve and the said shaft,- said blade being of downwardly reducing size and having serrated longitudinal edge portions. 2. A parafiln 'scraper'comprising a suspended shaft, a sleeve 'rotatably mounted on the shaft and having an outstanding flanged structure extending longitudinally thereon, said sleeve'being provided with internal threads at its lower portion, a scraper blade having a threaded shank disposed into the threaded lower portion of the sleeve, and bearing means between the sleeveand the shaft. I

LEEMAN ROY UNDERWOOD. 

